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ECU 128, SID 326 Fail 03 Fault 02 YouTube . Up to 15% cash back tomcm28. 2012 freightliner cascadia dd15 fault code ecu 1. Freightliner Mercedes Engine apexautodesigns from apexautodesigns.blogspot.com Prior to the fault code the engine bogged down really bad and solid yellow and check engine light come on. I have a 2006 freightliner columbia,. Code ecu 128 comes up on dash.